[#std-shared_lock-0b-2conversion]
= xref:std.adoc[std]::xref:std/shared_lock-0b.adoc[shared_lock<folly::SharedMutexImpl<ReaderPriority, Tag_, Atom, Policy>>]::operator bool
:relfileprefix: ../../
:mrdocs:

Reports whether this lock currently owns a shared lock.

== Synopsis

Declared in `<folly/SharedMutex.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
operator bool() const noexcept;
----

== Return Value

`true` if a shared lock is held.


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